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Contrasting grass nitrogen strategies reflect interspecific trade-offs between nitrogen acquisition and use in a semi-arid temperate grassland
Xi, Nianxun; Zhu, Bi-Ru; Zhang, Da-Yong
2017
Source PublicationPLANT AND SOIL
Volume418Issue:43102Pages:267-276
AbstractNitrogen (N) niche differentiations play an important role in community structure and biogeochemical cycling in terrestrial ecosystems. However, very few studies have examined how plant N strategies specialize via trade-offs between N acquisition and use abilities under natural field conditions. A field experiment was conducted to investigate N strategies by coexisting grass species using the in-situ stable isotope labeling technique. We injected N-15-labeled nitrate, N-15-labeled ammonium, and C-13-N-15-labeled glycine solutions in early and late vegetative growing seasons. Shoot delta N-15 and N concentration were measured to determine the N uptake and use abilities of 4 common species. All plant species preferred to take up nitrate (the dominant N form) over ammonium and glycine, and N-acquisition capacity varied with temporal variation of soil N. However, the dominant species was more N-conservative than less-dominant species and had lower overall N uptake rates (shoot N-15 excess 48 hours after injection) and higher N use efficiencies (aboveground biomass : N ratio). The different N strategies may reflect mixed effects of environmental filtering and interspecific competition and have significant implications for species coexistence as well as for ecosystem functions such as nutrient cycling.
Department其他
KeywordNiche Differentiation Nitrogen Form Plant Phenology Species Coexistence Stable Isotope
Language英语
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/10743
Collection其他
Recommended Citation
GB/T 7714
Xi, Nianxun,Zhu, Bi-Ru,Zhang, Da-Yong. Contrasting grass nitrogen strategies reflect interspecific trade-offs between nitrogen acquisition and use in a semi-arid temperate grassland[J]. PLANT AND SOIL,2017,418(43102):267-276.
APA Xi, Nianxun,Zhu, Bi-Ru,&Zhang, Da-Yong.(2017).Contrasting grass nitrogen strategies reflect interspecific trade-offs between nitrogen acquisition and use in a semi-arid temperate grassland.PLANT AND SOIL,418(43102),267-276.
MLA Xi, Nianxun,et al."Contrasting grass nitrogen strategies reflect interspecific trade-offs between nitrogen acquisition and use in a semi-arid temperate grassland".PLANT AND SOIL 418.43102(2017):267-276.
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